Improvement of Call Level Loss Performance using Speed-Sensitive CAC in Hierarchical Heterogeneous Wireless Networks
D.C.Vinod Rathna Kumar1, K.Ramudu2

1D.C.Vinod Rathna Kumar, ECE Department, AITS, Rajampet, A.P., India.
2K.Ramudu, Assistant Prof. of ECE Department, AITS Rajampet, A.P., India.

Manuscript received on July 01, 2012. | Revised Manuscript received on July 05, 2012. | Manuscript published on July 10, 2012. | PP: 81-84 | Volume-1, Issue-2, July 2012. | Retrieval Number: C8893019320/2012©BEIESP
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Abstract: Call Admission Control (CAC) prevents oversubscription of VoIP networks. It is used in the call set-up phase and applies to real-time media traffic as opposed to data traffic. The basic idea is the blocked calls from fast-speed users are redirected to high-tier large Cells, and the slow speed users are redirected to low-tier cells. A hierarchical overlay structure is an alternative solution that integrates existing and future heterogeneous wireless networks to provide subscribers with better mobile broadband services. Traffic loss performance in such integrated heterogeneous networks is necessary for an operator’s network dimensioning and planning. This paper investigates the computationally efficient loss performance modeling for multiservice in hierarchical heterogeneous wireless networks. An approximation model with guaranteed accuracy and low computational complexity is presented for the loss performance of multiservice traffic. 
Keywords: Call Admission Control (CAC), Hierarchical overlay wireless network , Long Term Evaluation (LTE), performance evaluation, Quality of Service(QOS),